media: dvb_demux: fix a bug for the continuity counter

[ Upstream commit 7efb10d ]

In dvb_demux.c, some logics exist which compare the expected
continuity counter and the real continuity counter. If they
are not matched each other, both of the expected continuity
counter and the real continuity counter should be printed.
But there exists a bug that the expected continuity counter
is not correctly printed. The expected continuity counter is
replaced with the real countinuity counter + 1 so that
the epected continuity counter is not correclty printed.
This is wrong. This bug is fixed.

Link: https://lore.kernel.org/linux-media/20230305212519.499-1-yongsuyoo0215@gmail.com

Signed-off-by: YongSu Yoo <yongsuyoo0215@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/media/dvb-core/dvb_demux.c

@@ -115,12 +115,12 @@ static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 
 	cc = buf[3] & 0x0f;
 	ccok = ((feed->cc + 1) & 0x0f) == cc;
-	feed->cc = cc;
 	if (!ccok) {
 		set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 		dprintk_sect_loss("missed packet: %d instead of %d!\n",
 				  cc, (feed->cc + 1) & 0x0f);
 	}
+	feed->cc = cc;
 
 	if (buf[1] & 0x40)	// PUSI ?
 		feed->peslen = 0xfffa;
@@ -300,7 +300,6 @@ static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 
 	cc = buf[3] & 0x0f;
 	ccok = ((feed->cc + 1) & 0x0f) == cc;
-	feed->cc = cc;
 
 	if (buf[3] & 0x20) {
 		/* adaption field present, check for discontinuity_indicator */
@@ -336,6 +335,7 @@ static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 		feed->pusi_seen = false;
 		dvb_dmx_swfilter_section_new(feed);
 	}
+	feed->cc = cc;
 
 	if (buf[1] & 0x40) {
 		/* PUSI=1 (is set), section boundary is here */